CN115286868A - Preparation process of environment-friendly and energy-saving PP material - Google Patents
Preparation process of environment-friendly and energy-saving PP material Download PDFInfo
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- CN115286868A CN115286868A CN202211061516.8A CN202211061516A CN115286868A CN 115286868 A CN115286868 A CN 115286868A CN 202211061516 A CN202211061516 A CN 202211061516A CN 115286868 A CN115286868 A CN 115286868A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/10—Homopolymers or copolymers of propene
- C08J2423/14—Copolymers of propene
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
- C08K3/013—Fillers, pigments or reinforcing additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/0041—Optical brightening agents, organic pigments
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Abstract
The invention discloses a preparation process of an environment-friendly and energy-saving PP material, which comprises the following steps: step S1, preparing raw materials; step S2, mixing the raw materials, which comprises the following steps: the first process step is as follows: feeding a polypropylene resin into a mixer; the second process step: putting the pigment into a mixer for mixing, wherein the adding temperature of the pigment ranges from 60 ℃ to 65 ℃; the third step is as follows: putting the auxiliary agent into a mixer for low-speed mixing, wherein the adding temperature of the auxiliary agent is 70-75 ℃; the fourth step: the mixture is rotated and mixed in a mixer at a high speed until the temperature of the mixture is raised to 85-90 ℃; the fifth step: putting the mixture into a cooling discharge barrel from a mixer for cooling; the sixth process step: putting the mixture into a daily bucket for later use; step S3, gelling and mixing; s4, forming a film; s5, stretching and embossing; s6, tempering the diaphragm; s7, cooling the diaphragm; and S8, rolling the membrane.
Description
Technical Field
The invention relates to the field of plastic manufacturing, in particular to a preparation process of an environment-friendly and energy-saving PP material.
Background
Polypropylene, abbreviated as PP, is a polymer formed by the polyaddition of propylene and is a colorless, odorless, nontoxic and semitransparent solid substance. The polypropylene has chemical resistance, heat resistance, electrical insulation, high-strength mechanical property and good high-wear-resistance processing property, and the polypropylene has good physical and chemical properties, so that the polypropylene is widely developed and applied in various fields such as machinery, automobiles, electronic appliances, buildings, textiles, packaging, agriculture, forestry, fishery, food industry and the like, and enterprises also perform modification treatment on polypropylene materials pertinently according to actual use requirements according to different use fields of the polypropylene.
At present, the transparent modified polypropylene has excellent transparency and surface gloss, and has more excellent heat deformation resistance compared with other plastic materials such as PET, PVC, PS and the like, so that the transparent modified polypropylene is widely favored by enterprises and is a development trend of future transparent films.
At present, two main transparent modification methods are provided: 1. a metallocene catalyst is adopted in the PP polymerization process to increase the transparency of PP; 2. adding a transparency modifier to ordinary polypropylene increases the transparency of PP, and the transparency modifier is, for example: sorbitol benzylidene derivatives, sodium benzoate, organic phosphates.
However, there are the following problems:
1. both metallocene catalysts and transparent modifiers have certain toxicity and pollution, so that byproducts generated in the production process are directly discharged to seriously damage the environment.
2. The by-product treatment is needed, related matched treatment equipment is needed, the production energy consumption is improved, and the by-product treatment process is complex and influences the production efficiency.
3. The metallocene catalyst is also a transparent modifier, has high raw material cost, and causes troubles to large-scale industrial production.
Disclosure of Invention
In view of the above disadvantages of the prior art, the present invention aims to provide a process for preparing an environment-friendly and energy-saving PP material, which has the advantages.
The technical purpose of the invention is realized by the following technical scheme:
a preparation process of an environment-friendly energy-saving PP material comprises the following steps:
step S1, preparing raw materials: preparing polypropylene resin, natural calcium powder, an auxiliary agent and a pigment;
step S2, mixing the raw materials, which comprises the following steps:
the first process step is as follows: feeding a polypropylene resin into a mixer;
the second step is as follows: putting the pigment into a mixer for mixing, wherein the adding temperature of the pigment ranges from 60 ℃ to 65 ℃;
the third step is as follows: putting the auxiliary agent into a mixer for low-speed mixing, wherein the adding temperature of the auxiliary agent is 70-75 ℃;
the fourth step: the mixture is rotated and mixed in the mixer at high speed until the temperature of the mixture is raised to 85-90 ℃;
the fifth step: putting the mixture into a cooling discharge barrel from the mixer for cooling;
the sixth process step: putting the mixture into a daily bucket for later use;
step S3, gelling and kneading: the mixture is sequentially sheared by a planetary extruder and gelatinized and kneaded by a rolling wheel machine;
step S4, film formation: the mixture is sent to a calender to be calendered and formed into a membrane;
step S5, stretch embossing: the membrane is sequentially stretched by a guide wheel, embossed by an embossing device and finally extended by longitudinal stretching equipment;
step S6, tempering the diaphragm: tempering the diaphragm through a tempering device;
step S7, cooling the diaphragm: the diaphragm is cooled by a cooling wheel;
step S8, rolling the membrane: and finishing rolling the membrane on a rolling machine to obtain a finished product.
Further, in the second step of step S2, the mixing temperature of the coloring material is set to 60 ℃.
Further, in the second step of step S2, the mixing time of the coloring material is 360 seconds.
Further, in the third step of step S2, the mixing temperature of the auxiliary agents is set to 70 ℃.
Further, in the third step of step S2, the mixing time of the auxiliary agents at a low speed is 300S.
Further, in the third step of step S2, the rotation speed of the adjuvant is 500RPM.
Further, in the fourth step of step S2, high-speed mixing is started when the mix temperature reaches 75 ℃ until the mix temperature reaches 85 ℃.
Further, in the fourth step of step S2, the rotation speed of the high-speed mixing is 2000RPM.
Further, in a fifth step of step S2, the cooling temperature of the mix is in the range of 50 to 55 ℃.
Further, in step S1, the components are counted in parts by weight: the components are counted according to parts by weight: 50-80 parts of polypropylene resin, 20-50 parts of natural calcium powder, 0.5-1 part of lubricant and 0.003 part of pigment as an auxiliary agent; wherein the lubricant is one or more of long-chain fatty acid ester, and the modifier is one or more of copolymer PP.
In conclusion, the invention has the following beneficial effects:
1. the feeding sequence is optimized, and a mixing temperature window suitable for the use agents is selected, so that each use agent is more fully fused with the polypropylene resin, the mixing uniformity is improved, the number of crystal mixed points of the formed film is less, the pigment distribution is more uniform, and the transparency and the quality of the finished film are greatly improved.
2. In the process of mixing the auxiliary agents, a low-speed mixing mode is adopted, then a high-speed mixing mode is adopted, the auxiliary agents are poor in flowability in the low-speed mixing stage, but in the low-speed mixing process, the temperature is gradually increased, the flowability of the auxiliary agents is improved, after the specified temperature is reached, high-speed mixing is started, meanwhile, the temperature is increased, the flowability of the auxiliary agents is better, and then the auxiliary agents are uniformly dispersed in the polypropylene resin, and finally high-quality mixing is achieved.
3. Shearing by a planetary extruder and gelatinizing and mixing by a rolling wheel machine, rolling by a rolling machine to form a membrane, then stretching, embossing and redrawing to obtain a film with the thickness of 0.06-0.8 mm, and finally tempering and cooling to shape the film.
4. The natural calcium powder with CaCO3 as a main component is used as a main transparent modifier, on one hand, the natural calcium powder is nontoxic, and byproducts generated by reaction are nontoxic and cannot damage the environment, on the other hand, the natural calcium powder has rich material sources and low price, the cost of production raw materials is reduced, and the production equipment cost is also reduced without additionally arranging matched waste treatment equipment on a production line.
Drawings
FIG. 1 is a schematic flow chart of the steps of a preparation process of an environment-friendly and energy-saving PP material.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following process of the present invention is further described in detail with reference to the accompanying drawings and the detailed description. The advantages and features of the present invention will become more apparent from the following description.
Example 1:
a preparation process of an environment-friendly and energy-saving PP material is shown in figure 1 and comprises the following steps:
step S1, preparing raw materials: preparing polypropylene resin, natural calcium powder, an auxiliary agent and a pigment;
wherein the raw materials are prepared according to the following components by weight: 50 parts of polypropylene resin, 20 parts of natural calcium powder, 0.5 part of auxiliary agent and 0.003 part of pigment.
Specifically, the adjuvant comprises a lubricant and a modifier, wherein the lubricant is glycerin fatty acid triester; the modifier is copolymerized PP.
Step S2, mixing the raw materials, which comprises the following steps:
a first process step: the polypropylene resin was charged into a mixer.
The second step is as follows: the pigment was fed into a mixer to mix, the input temperature of the pigment was set at 60 ℃ and the mixing time was set at 360s.
The third step is as follows: putting the adjuvant into a mixer for low-speed mixing at a rotating speed of 500RPM, wherein the temperature range of the adjuvant is 70 ℃, and the time is set to be 300s;
the fourth step: after the mix temperature in the mixer had risen to 75 ℃, the mix was mixed in the mixer by high speed rotation at 2000RPM until the mix temperature rose to 85 ℃ for 300s. So as to ensure the pigment and the auxiliary agent to be dispersed evenly.
The fifth step: the mixture was put from the mixer into a chill vent drum and cooled to 50 ℃.
The sixth process step: the mixture is put into a daily bucket for standby.
Step S3, gelling and kneading: the mixture is sequentially sheared by a planetary extruder and gelatinized and kneaded by a rolling wheel machine;
step S4, film formation: the mixture is sent to a calender to be calendered and formed into a membrane;
step S5, stretching and embossing: the membrane is sequentially stretched by a guide wheel, embossed by an embossing device and finally extended by longitudinal stretching equipment;
step S6, tempering the diaphragm: tempering the diaphragm through a tempering device;
step S7, cooling the diaphragm: the diaphragm is cooled by a cooling wheel;
step S8, rolling the membrane: and finishing rolling the membrane on a rolling machine to obtain a finished product, wherein the rolling tension is 300-400N.
Example 2:
a preparation process of an environment-friendly and energy-saving PP material is shown in figure 1 and comprises the following steps:
step S1, raw material preparation: preparing polypropylene resin, natural calcium powder, an auxiliary agent and a pigment;
wherein the raw materials are prepared according to the following components by weight: 60 parts of polypropylene resin, 40 parts of natural calcium powder, 0.8 part of auxiliary agent and 0.0003 part of pigment.
Specifically, the adjuvant comprises a lubricant and a modifier, wherein the lubricant is a mixture of glycerin fatty acid triester and alkyl fatty acid monoglyceride; the modifier is the mixture of block copolymer polypropylene (PP-B) and random copolymer polypropylene (PP-R).
Step S2, mixing the raw materials, which comprises the following steps:
the first process step is as follows: the polypropylene resin was charged into a mixer.
The second process step: the colorant was fed into a mixer and mixed, the charging temperature of the colorant was set at 62 ℃ and the mixing time was set at 360 seconds.
The third step: putting the auxiliary agent into a mixer for low-speed mixing, wherein the adding temperature of the auxiliary agent is 72 ℃, and the time is set to be 300s;
a fourth step of: after the mix temperature in the mixer had risen to 75 ℃, the mix was mixed in the mixer with high speed rotation until the mix temperature rose to 88 ℃ and the high speed mixing time was 300s. So as to ensure the pigment and the auxiliary agent to be dispersed evenly.
The fifth step: the mixture was poured from the mixer into a vented tank and cooled to 53 ℃.
The sixth process step: the mixture is put into a daily bucket for standby.
Step S3, gelling and kneading: the mixture is sequentially sheared by a planetary extruder and gelatinized and kneaded by a rolling wheel machine;
step S4, film formation: the mixture is sent to a calender to be calendered and formed into a membrane;
step S5, stretching and embossing: the membrane is sequentially stretched by a guide wheel, embossed by an embossing device and finally extended by longitudinal stretching equipment;
step S6, tempering the diaphragm: tempering the diaphragm through a tempering device;
step S7, cooling the diaphragm: the diaphragm is cooled by a cooling wheel;
step S8, rolling the membrane: and finishing rolling the membrane on a rolling machine to obtain a finished product.
Example 3:
a preparation process of an environment-friendly and energy-saving PP material is shown in figure 1 and comprises the following steps:
step S1, raw material preparation: preparing polypropylene resin, natural calcium powder, an auxiliary agent and a pigment;
wherein the raw materials are prepared according to the following components by weight: 80 parts of polypropylene resin, 50 parts of natural calcium powder, 1 part of an auxiliary agent and 0.003 part of a pigment.
Specifically, the adjuvant comprises a lubricant and a modifier, wherein the lubricant is a mixture of glycerin fatty acid triester and alkyl fatty acid monoglyceride; the modifier is the mixture of block copolymer polypropylene (PP-B) and random copolymer polypropylene (PP-R).
Step S2, mixing the raw materials, which comprises the following steps:
the first process step is as follows: the polypropylene resin was charged into a mixer.
The second step is as follows: the colorant was fed into the mixer to mix, the input temperature of the colorant was set at 65 ℃ and the mixing time was set at 360s.
The third step is as follows: putting the auxiliary agent into a mixer for low-speed mixing, wherein the adding temperature of the auxiliary agent is 75 ℃, and the time is set to 300s;
the fourth step: after the mix temperature in the mixer had risen to 75 ℃, the mix was mixed in the mixer with high speed rotation until the mix temperature rose to 90 ℃ and the high speed mixing time was 300s. So as to ensure the pigment and the auxiliary agent to be dispersed evenly.
The fifth step: the mixture was poured from the mixer into a chill-release bucket and cooled to 53 ℃.
The sixth process step: the mixture is put into a daily bucket for standby.
Step S3, gelling and kneading: shearing the mixture by a planetary extruder and gelatinizing and mixing the mixture by a rolling mill in sequence;
step S4, film formation: the mixture is sent to a calender to be calendered and formed into a membrane;
step S5, stretching and embossing: the membrane is sequentially stretched by a guide wheel, embossed by an embossing device and finally extended by longitudinal stretching equipment;
step S6, tempering the diaphragm: tempering the diaphragm through a tempering device;
step S7, cooling the diaphragm: the diaphragm is cooled by a cooling wheel;
step S8, rolling the membrane: and finishing rolling the membrane on a rolling machine to obtain a finished product.
And (3) detecting the quality of the mixture:
detecting and sampling requirements: in a sixth process step of step S2, a sample of mix is randomly selected from the daily bucket.
Detecting an object: example 1, example 2, and example 3.
And (3) detection results: see table 1.
TABLE 1
And (4) conclusion: the pigment of the mixed material is uniformly dispersed, the chromaticity difference is improved by 0.2 degrees, and the crystal impurity points are reduced by nearly 50 percent compared with the traditional process sample.
And (3) detecting the quality of the finished film product:
detecting an object: examples 1, 2 and 3.
And (3) detection results: see table 2.
TABLE 2
And (4) conclusion:
1. the average GV value for examples 1-3 was 26, giving about a 30% improvement over the conventional standard.
2. The average surface roughness Ra of examples 1 to 3 was 39uin, which is about 10% higher than that of the conventional standard, and the film was smoother.
3. The tensile strength of examples 1-3 was 2710psi, which provides about a 35% improvement over the conventional standard, and the films were tougher.
4. The elongation of examples 1 to 3 was 113%, and the performance was improved by about 25.5% as compared with the conventional standard, and the film deformation performance was more excellent.
5. The light transmittance of examples 1 to 3 was 21.8%, the performance was improved by about 10% compared to the conventional standard, and the film was more transparent.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The preparation process of the environment-friendly energy-saving PP material is characterized by comprising the following steps of:
step S1, preparing raw materials: preparing polypropylene resin, natural calcium powder, an auxiliary agent and a pigment;
step S2, mixing the raw materials, which comprises the following steps:
the first process step is as follows: feeding a polypropylene resin into a mixer;
the second process step: putting the pigment into a mixer for mixing, wherein the adding temperature of the pigment ranges from 60 ℃ to 65 ℃;
the third step is as follows: putting the auxiliary agent into a mixer for low-speed mixing, wherein the adding temperature of the auxiliary agent is 70-75 ℃;
the fourth step: the mixture is rotated and mixed in a mixer at a high speed until the temperature of the mixture is raised to 85-90 ℃;
the fifth step: putting the mixture into a cooling discharge barrel from the mixer for cooling;
the sixth process step: putting the mixture into a daily bucket for later use;
step S3, gelling and kneading: shearing the mixture by a planetary extruder and gelatinizing and mixing the mixture by a rolling mill in sequence;
step S4, film forming: the mixture is sent to a calender to be calendered and formed into a membrane;
step S5, stretch embossing: the membrane is stretched by a drawing wheel, embossed by an embossing device and stretched by longitudinal stretching equipment;
step S6, tempering the diaphragm: tempering the diaphragm through a tempering device;
step S7, cooling the diaphragm: the diaphragm is cooled by a cooling wheel;
step S8, rolling the membrane: and finishing rolling the membrane on a rolling machine to obtain a finished product.
2. The preparation process of the environment-friendly and energy-saving PP material as claimed in claim 1, wherein: in the second step of step S2, the mixing temperature of the coloring material is set to 60 ℃.
3. The preparation process of the environment-friendly and energy-saving PP material as claimed in claim 2, wherein: in the second step of step S2, the mixing time of the coloring materials is 360 seconds.
4. The preparation process of the environment-friendly energy-saving PP material as claimed in claim 3, characterized in that: in a third step of step S2, the mixing temperature of the auxiliary agents is set to 70 ℃.
5. The preparation process of the environment-friendly energy-saving PP material as claimed in claim 4, characterized in that: in the third step of step S2, the mixing time of the adjuvant at low speed is 300S.
6. The preparation process of the environment-friendly and energy-saving PP material as claimed in claim 5, wherein: in the third step of step S2, the rotational speed of the adjuvant is 500RPM for low-speed mixing.
7. The preparation process of the environment-friendly and energy-saving PP material as claimed in claim 6, wherein: in the fourth step of step S2, high-speed mixing is started when the mix temperature reaches 75 ℃ until the mix temperature reaches 85 ℃.
8. The preparation process of the environment-friendly and energy-saving PP material as claimed in claim 7, wherein: in the fourth step of step S2, the rotation speed of the high-speed mixing is 2000RPM.
9. The preparation process of the environment-friendly and energy-saving PP material as claimed in claim 8, wherein: in the fifth step of step S2, the cooling temperature of the mix is in the range of 50 to 55 ℃.
10. The preparation process of the environment-friendly and energy-saving PP material as claimed in claim 1, wherein: in step S1, the components are counted in parts by weight: 50-80 parts of polypropylene resin, 20-50 parts of natural calcium powder, 0.5-1 part of lubricant and 0.003 part of pigment as an auxiliary agent; wherein the lubricant is one or more of long-chain fatty acid ester, and the modifier is one or more of copolymerized PP.
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| CN2022107462542 | 2022-06-28 | ||
| CN202210746254.2A CN114874553A (en) | 2022-06-28 | 2022-06-28 | Preparation process of environment-friendly and energy-saving PP material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002194155A (en) * | 2000-10-20 | 2002-07-10 | Bando Chem Ind Ltd | Polypropylene resin composition for calendering, film obtained from it, and its manufacturing method |
| CN103978653A (en) * | 2014-05-27 | 2014-08-13 | 浙江金瑞薄膜材料有限公司 | Process for manufacturing PP (polypropylene) water-resistant and breathable film |
| CN108178887A (en) * | 2017-12-29 | 2018-06-19 | 浙江成如旦新能源科技股份有限公司 | A kind of fire-resistant antistatic coating film and its preparation process |
| CN109476133A (en) * | 2016-07-21 | 2019-03-15 | Omya国际股份公司 | The calcium carbonate of cavitation agent as biaxially oriented polypropylene film |
| CN110819000A (en) * | 2019-10-18 | 2020-02-21 | 温州大学 | Waterproof ventilated membrane of polypropylene |
| CN112063052A (en) * | 2020-09-18 | 2020-12-11 | 无锡宏义高分子材料科技有限公司 | Environment-friendly paper product and preparation method thereof |
-
2022
- 2022-06-28 CN CN202210746254.2A patent/CN114874553A/en not_active Withdrawn
- 2022-09-01 CN CN202211061516.8A patent/CN115286868A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002194155A (en) * | 2000-10-20 | 2002-07-10 | Bando Chem Ind Ltd | Polypropylene resin composition for calendering, film obtained from it, and its manufacturing method |
| CN103978653A (en) * | 2014-05-27 | 2014-08-13 | 浙江金瑞薄膜材料有限公司 | Process for manufacturing PP (polypropylene) water-resistant and breathable film |
| CN109476133A (en) * | 2016-07-21 | 2019-03-15 | Omya国际股份公司 | The calcium carbonate of cavitation agent as biaxially oriented polypropylene film |
| CN108178887A (en) * | 2017-12-29 | 2018-06-19 | 浙江成如旦新能源科技股份有限公司 | A kind of fire-resistant antistatic coating film and its preparation process |
| CN110819000A (en) * | 2019-10-18 | 2020-02-21 | 温州大学 | Waterproof ventilated membrane of polypropylene |
| CN112063052A (en) * | 2020-09-18 | 2020-12-11 | 无锡宏义高分子材料科技有限公司 | Environment-friendly paper product and preparation method thereof |
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| CN114874553A (en) | 2022-08-09 |
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